Portable instrument for measuring water depth



FIG. 1 is a top, front and left side perspective view of a portable instrument for measuring water depth showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof and a mirror image of the right side view;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The electrical cord member being shown broken away for ease of illustration in the drawing. 

The ornamental design for a portable instrument for measuring water depth, as shown and described. 